Housing for vehicular hvac system and dual hvac system

ABSTRACT

A heating, ventilation, and air conditioning (HVAC) system for a vehicle is disposed within a housing. The housing includes a case and a drainage port that drains fluid from the case of the housing. The drainage port has a conduit member that defines an inlet coupled to the case and an outlet. The case and the conduit member define a fluid passage that has a first area adjacent to the inlet and a second area adjacent to the outlet, the second area is smaller than the first area such that a velocity of fluid at the outlet is greater than at the inlet of the conduit member

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No. 61/949,340 filed on Mar. 7, 2014 and U.S. Provisional Application No. 61/949,346 filed on Mar. 7, 2014. The entire disclosures of the above applications are incorporated herein by reference.

FIELD

The present disclosure relates to a housing for a vehicular heating, ventilation and air conditioning (HVAC) system.

BACKGROUND

This section provides background information related to the present disclosure which is not necessarily prior art. A vehicle may include a dual heating, ventilation and air conditioning (HVAC) system for conditioning the air in a passenger cabin of the vehicle. For instance, the dual HVAC system includes one HVAC system dedicated for the front passenger compartment and a second HVAC system dedicated for the rear passenger compartment. The dual HVAC system heats and cools air blown through respective HVAC systems using a heating heat exchanger (i.e., a heater core) and/or a cooling heat exchanger (i.e., an evaporator). The dual HVAC system has two independently operated systems that have essentially the same components, and can be disposed adjacent to each other.

As the HVAC system(s) operates, water condensation from the components begin to collect. A drainage port is usually provided as part of the housing of the HVAC system for discharging fluid, such as water and air, from the housing. The dual HVAC system includes a separate drainage port for each of the systems.

With the rising cost of material, there is a need to reduce the cost and complexity of such dual HVAC systems. Development in dual HVAC systems has led to integrated components, which are components utilized for both HVAC systems (e.g., integrated evaporator). However, when developing integrated components, it is important that the two HVAC systems continue to operate independently from one another. Furthermore, the operation of one HVAC system should not affect the performance of the other HVAC system.

SUMMARY

This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features. The present disclosure provides for a housing for a heating, ventilation, and air conditioning HVAC system for a vehicle. The housing may include a case that houses components of the HVAC system, and a drainage port draining fluid from the HVAC system. The drainage port may include a conduit member that defines an outlet and an inlet coupled to the case. The case and the conduit member define a fluid passage that has a first area adjacent to the inlet and a second area adjacent to the outlet, the second area is smaller than the first area such that a velocity of fluid at the outlet is greater than at the inlet of the conduit member.

In another aspect, the present disclosure provides for a housing for a dual heating, ventilation, and air conditioning HVAC system for a vehicle. The housing includes a first chamber, a second chamber, and a drainage port. The first chamber may house a first HVAC system of the dual HVAC system and the second chamber may house a second HVAC system. The drainage port drains fluid from the first chamber and from the second chamber. The drainage port may include a spout, a conduit member, and an auxiliary passage. The auxiliary passage fluidly couples the second chamber to the spout. The conduit member fluidly couples the first chamber to the spout, and may define an inlet coupled to the first chamber and an outlet coupled to the spout. The conduit member and the first chamber define a fluid passage that has a first area adjacent to the inlet and a second area adjacent to the outlet. The second area is smaller than the first area such that a velocity of fluid at the outlet is greater than at the inlet of the conduit member. The conduit member of the drainage port may create a suction for drawing out fluid from the first chamber and from the second chamber.

In yet in another aspect, the present disclosure provides for a dual heating, ventilation, and air conditioning HVAC system for a vehicle that may include an integrated evaporator and a housing. The integrated evaporator conditions air and may have a first member and a second member. The first member experiences a higher air pressure than the second member. The housing may house the integrated evaporator and may include a drainage port. The drainage port of the housing is disposed adjacent to the integrated evaporator such that the drainage port aligns with the first member of the integrated evaporator. The drainage port may create a low pressure area across a portion of the first member of the integrated evaporator, thereby drawing fluid from the first member to the drainage port.

Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.

DRAWINGS

The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.

FIG. 1 illustrates a vehicle having a front HVAC system and a rear HVAC system;

FIG. 2 illustrates the front HVAC system and the rear HVAC system within a housing having a drainage port of the present disclosure;

FIG. 3 is a partial cross-sectional view of a case having the drainage port;

FIG. 4 is an expanded view of the drainage port of FIG. 3;

FIG. 5 illustrates a front HVAC system and a rear HVAC system utilizing an integrated evaporator;

FIG. 6 is a perspective view of the integrated evaporator disposed in a case having a drainage port in a second embodiment of the present disclosure;

FIG. 7 is perspective view of the case of FIG. 6;

FIG. 8 is a partial cross-sectional view of the case of FIG. 7; and

FIG. 9 is an expanded view of the drainage port of FIG. 8.

Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings.

DETAILED DESCRIPTION

The present disclosure will now be described more fully with reference to the accompanying drawings. With reference to FIG. 1, a vehicle 10 having a dual heating, ventilation, and air conditioning (HVAC) system is presented. The vehicle 10 includes a front HVAC system 12 and a rear HVAC system 14. The front HVAC system 12 and the rear HVAC system 14 may be referred to as the HVAC systems 12 and 14. The HVAC systems 12 and 14 are disposed within an engine compartment of the vehicle 10 and are positioned behind a dashboard of the vehicle 10. The HVAC systems 12 and 14 heat and/or cool air within a passenger compartment of the vehicle 10. The front HVAC system 12 heats and cools a front cabin 18 and the rear HVAC system 14 heats and cools the rear cabin 20. While the present disclosure discusses primary components of the HVAC systems 12 and 14, it is understood that other components may be needed for the overall operation of the HVAC systems 12 and 14.

FIG. 2 illustrates a portion of the HVAC systems 12 and 14, which are positioned next to each other. The HVAC systems 12 and 14 include the same components, and are housed in a housing 22. The housing 22 includes multiple pieces that are coupled together via mechanical fasteners and/or adhesives. The housing 22 may be formed out of resin such as polypropylene. The housing 22 defines a front HVAC chamber 24 for housing the front HVAC system 12 and a rear HVAC chamber 26 for housing the rear HVAC system 14. The front HVAC chamber 24 is separated from the rear HVAC chamber 26, such that the two HVAC systems 12 and 14 operate independently from each other. Specifically, the housing 22 fluidly seals the HVAC systems 12 and 14 from each other to prevent fluid, such as water and/or air, from being exchanged between the systems 12 and 14. In the following description, information related to the components and operation of the HVAC system 12 is also applicable to the HVAC system 14.

The HVAC system 12 includes a blower unit (not shown), an evaporator 30, and a heater core 32. The front HVAC chamber 24 defines multiple air passages 34 in which the air is conditioned before being blown into the front cabin 18 via one or more outlets 36. The outlets 36 are coupled to the air vents (not shown) disposed in the front cabin 18. The outlets 36 are closed/opened by one or more doors 38.

The blower unit draws in air into the HVAC system 12 from the outside. The air drawn in by the blower unit flows through the evaporator 30. The evaporator 30 is a heat exchanger and cools air flowing through the evaporator 30, as is known in the art. The heater core 32 is positioned downstream from the evaporator 30 in an air flow direction. The amount of air entering the heater core 32 is controlled via one or more doors 40. The heater core 32 heats the air flowing through the heater core 32. The air flowing from the evaporator 30 and/or the heater core 32 flows through the air passages 34 where it is conditioned to a desired temperature before entering the front cabin 18. Likewise, with regard to the rear HVAC system 14, the air flowing from the evaporator 30 and/or the heater core 32 flows through the air passages 34 where it is conditioned to a desired temperature before entering the rear cabin 20.

As the HVAC systems 12 and 14 operate, water condensates on the components, such as the evaporators 30 and the heater cores 32. To discharge the water condensation from the HVAC systems 12 and 14, the housing 22 includes a drainage port 50. The drainage port 50 expels fluid, such as water and/or air, from the housing 22 to a drain pan (not shown).

FIG. 3 illustrates a partial cross-sectional view of a case 52 having the drainage port 50. The case 52 is one of the pieces that make up the housing 22. The case 52 forms a portion of the front HVAC chamber 24 and the rear HVAC chamber 26. For example, the case 52 has a first region 54 and a second region 56 that are separated by a partition 58. The first region 54 forms a portion of the rear HVAC chamber 26 and the second region 56 forms a portion of the front HVAC chamber 24.

The case 52 may include mouth sections 60 and 62 at the first region 54 and the second region 56, respectively, for connecting the case 52 to the drainage port 50. The mouth sections 60 and 62 are depicted as having a tapered shape for directing fluid from the casing 52 to the drainage port 50.

Referring to FIG. 4, the drainage port 50 includes a spout 70 and a conduit member 72, and defines an orifice 74. Fluid from the housing 22 is discharged via an opening 76 defined by the spout 70.

The conduit member 72 fluidly couples the first region 54 and the spout 70, and defines an inlet 80 and outlet 82. The conduit member 72 is disposed between the mouth section 60 of the first region 54 and the spout 70, such that the inlet 80 is connected to the mouth section 60 and the outlet 82 is connected at the spout 70. The conduit member 72 and the mouth section 60 form a first fluid passage 84 through which fluid travels from a first area defined by the mouth section 60 to a second area defined by the conduit member 72 of the drainage port 50. The second area defines a narrower path than the first area, such that a velocity of the fluid is higher at the outlet 82 of the conduit member 72 than at mouth section 60 or at the inlet 80. For example, the conduit member 72 may have a smaller diameter or width that the mouth section 60. The difference in velocity between the mouth section 60 and the outlet 82 creates suction that causes fluid to be drawn out from the first region 54 toward the spout 70.

In the example embodiment, the conduit member 72 has a substantially uniform shape in which the diameter is constant throughout. Alternatively, the conduit member 72 may have a varying shape in which the diameter of the inlet 80 is greater than the diameter of the outlet 82. For example, the conduit member 72 may have a funnel-like shape, a cone-like shape, or other suitable shape that generates a higher fluid velocity at the outlet 82 than at the inlet.

The orifice 74 may be positioned substantially adjacent to or downstream of the outlet 82 of the conduit member 72. The orifice 74 fluidly couples the second region 56 of the housing 22 and may be referred to as an auxiliary passage. In the example embodiment, the mouth section 62 tapers toward the spout 70 and the outlet 82 is defined between the mount section 62 and the spout 70. The mouth section 62, and the orifice 74 define a second fluid passage 86 such that fluid from the second region 56 is discharged via the spout 70. Alternatively, the drainage port 50 may include another conduit member for coupling the second region 56 to the spout 70. For example, the mouth section 62 may be configured like the mouth section 60. An auxiliary conduit member may be disposed adjacent to the conduit member 72 and may have an inlet coupled to the second region 56 and an outlet coupled at the spout 70. The outlets of the conduit member 72 and the auxiliary conduit member may be disposed next to each other at the spout 70.

By having a high velocity area at the outlet 82 of the conduit member 72, the drainage port 50 prevents fluid flowing out of the orifice 74 from entering the conduit member 72 or, even, the first region 54. In particular, when the rear HVAC system 14 is not operating and the front HVAC system 12 is operating, the first region 54 has a lower air pressure than the second region 56. The downward suction created by the conduit member 72, prevents fluid from the second region 56 from flowing toward the first region 54 and instead draws out the fluid from the mouth section 62 toward the spout 70.

The drainage port 50 discharges fluid, such as water accumulating in the rear HVAC chamber 26 and the front HVAC chamber 24, via a single drainage system. Furthermore, the conduit member 72 of the drainage port 50 prevents fluid from flowing between the rear HVAC chamber 26 and the front HVAC chamber 24. Accordingly, the front HVAC system 12 does not affect the operation of the rear HVAC system 14, and vice versa.

In the example embodiment, the drainage port 50 is utilized for a housing that houses both HVAC systems 12 and 14. Alternatively, when the HVAC systems 12 and 14 are disposed adjacent to each other in separate housing, the case having the drainage port 50 may be configured between the two housings to have the housings share the same drainage port.

The drainage port of the present disclosure may also drain water from a high pressure area of an integrated evaporator that is utilized for both the rear and front HVAC systems. Specifically, with reference to FIG. 5, a front HVAC system 100 and a rear HVAC system 102 share an integrated evaporator 104 that has a first portion 104A for the front HVAC system 100, and a second portion 104B for the rear HVAC system 102. The evaporator 104 further includes a core member 106 disposed between header tanks 108. The HVAC systems 100 and 102 are disposed in a housing 110, and function in a similar manner as the HVAC systems 12 and 14.

With reference to FIG. 6, the evaporator 104 is disposed in a case 112 which includes a drainage port 114. The case 112 is part of the housing 110. As shown in FIG. 7, the drainage port 114 includes a bypass region 116 disposed within a main chamber 118. The bypass region 116 divides the main chamber 118 into two sections (a first region 118A and a second region 118B). The bypass region 116 aligns and abuts with a portion of the core member 106 of the evaporator 104, and the first region 118A and the second region 118B align with the remaining portion of the evaporator 104.

With reference to FIGS. 8 and 9, in addition to the bypass region 116, the drainage port 114 includes a conduit member 120 and a spout 122. The conduit member 120 defines an inlet 121 that is connected at the bypass region 116 and an outlet 123 that is connected at the spout 122. The bypass region 116 and the conduit member 120 define a flow passage 124 that extends along the core member 106 and to the spout 122. n the example embodiment, the flow passage 124 has a substantially uniform shape in which the width of the passage 124, as defined by the bypass region 116 and the conduit member 120, is substantially constant throughout. Alternatively, the flow passage 124 may have a varying shape such that the flow passage 124 tapers to a smaller width at the spout 122. For example, the width of the flow passage 124 may be greater along the bypass region 116 than at the conduit member 120.

The core member 106 of the evaporator 104 is a high pressure area. At times, water condensing along the core member 106 may not be able to flow toward a low pressure area, such as near the header tanks 108 of the evaporator 104. Therefore, water may be trapped within the evaporator 104, which affects the performance of the evaporator 104. The flow passage 124 of the drainage port 114 creates a low pressure area at the core member 106 of the evaporator 104, thereby allowing fluid, such as water, and/or air, to flow from the high pressure area of the core member 106 to the low pressure area of the flow passage 124. In addition, as the fluid flows from the bypass region 116 to the conduit member 120, the velocity of the fluid may increase such that the velocity is higher at the outlet 123 of the constricted conduit member 120 than along the bypass region 116.

Water collecting at the header tanks 108 flows down to the first region 118A and the second region 118B. Water collecting at the first region 118A is discharged via a drain pan (not shown), and water collecting in the second region 118B may be discharged via the drainage port 114. For example, the drainage port 114 defines an orifice 128 that fluidly couples the second region 118B to the spout 122. The orifice 128 is disposed adjacent to or downstream of the outlet 123 of the conduit member 120. Fluid flowing from the second region 118B flows through the orifice 128 and is discharged from the spout 122. Due to the high fluid velocity at the outlet 123, fluid from the second region 118B is prevented from entering the conduit member 120.

While the fluid from the second region 118B is depicted as being discharged from the discharge port 114, the case 112 may discharge the fluid using other suitable configurations. For example, in lieu of the orifice 128, the case 112 may include a separate drainage to drain water from the second region 118B.

Based on the foregoing, the front HVAC system 100 and the rear HVAC system 102 share the evaporator 104. During the operation of the front HVAC system 100 and/or the rear HVAC system 102, water condensation begins to form on the evaporator 104. Due to the configuration of the evaporator 104, water may not be able to flow from the high pressure area along the core member 106 of the evaporator 104 to the low pressure area, which is along the sides of the evaporator 104. The drainage port 114 creates a low pressure area for drawing water along the high pressure area. Accordingly, the water condensation is removed from the evaporator 104 without affecting the operation of the evaporator 104, and, furthermore, the performance of the HVAC systems 100 and 102.

While the drainage port of the present disclosure is described as part of a dual HVAC system, the drainage port may also be used with a single HVAC system to improve the discharge of fluid.

The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.

Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components and devices, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail. 

What is claimed is:
 1. A housing for a heating, ventilation, and air conditioning HVAC system for a vehicle, the housing comprising: a case housing components of the HVAC system; and a drainage port draining fluid from the HVAC system, the drainage port including a conduit member, wherein the conduit member defines an outlet and an inlet, the inlet is coupled to the case, the case and the conduit member define a fluid passage that has a first area adjacent to the inlet and a second area adjacent to the outlet, the second area is smaller than the first area such that a velocity of fluid at the outlet is greater than at the inlet of the conduit member.
 2. The housing of claim 1 wherein the conduit member has a funnel like shape.
 3. The housing of claim 1 wherein the drainage port includes a spout, and the outlet of the conduit member is connected to the spout.
 4. A housing for a dual heating, ventilation, and air conditioning HVAC system for a vehicle, the dual HVAC system including a first HVAC system and a second HVAC system, the dual HVAC system conditioning air for a front compartment and a rear compartment of the vehicle via the first and second HVAC systems, the housing comprising: a first chamber housing the first HVAC system; a second chamber housing the second HVAC system, the second chamber being different from the first chamber, wherein the first chamber and the second chamber are fluidly sealed from each other; and a drainage port draining fluid from the first chamber and from the second chamber, the drainage port having a spout, a conduit member, and an auxiliary passage wherein the spout discharges fluid from the dual HVAC system, the conduit member fluidly couples the first chamber to the spout, the conduit member defines an inlet coupled to the first chamber and an outlet coupled to the spout, the conduit member and the first chamber define a fluid passage that has a first area adjacent to the inlet and a second area adjacent to the outlet, the second area is smaller than the first area such that a velocity of fluid at the outlet is greater than at the inlet of the conduit member, and the auxiliary passage fluidly couples the second chamber to the spout.
 5. The housing of claim 4 wherein the auxiliary passage includes a orifice defined between the second chamber and the spout, the orifice is defined substantially adjacent to the outlet of the conduit member.
 6. The housing of claim 4 wherein the auxiliary passage includes a orifice defined between the second chamber and the spout, the orifice is defined downstream of the outlet of the conduit member.
 7. The housing of claim 4 wherein the conduit member has a funnel like shape.
 8. The housing of claim 4 wherein the auxiliary passage includes an auxiliary conduit member that defines an inlet and outlet, the inlet of the auxiliary conduit member couples to the second chamber and the outlet couples to the spout, the auxiliary conduit member and the second chamber define a second fluid passage that has a first area adjacent to the inlet of the auxiliary conduit member and a second area adjacent to the outlet of the auxiliary conduit member, the second area is smaller than the first area such that a velocity of fluid at the outlet of the auxiliary conduit member is greater than at the inlet of the auxiliary conduit member.
 9. The housing of claim 8 wherein the outlet of the conduit member and the outlet of the auxiliary conduit member are adjacent to each other at the spout.
 10. The housing of claim 4 wherein the first chamber includes a mouth section that tapers toward the drainage port and couples to the conduit member at the inlet.
 11. The housing of claim 4 wherein the second chamber includes a mouth section that tapers toward the spout of the drainage port, the auxiliary passage includes an orifice defined between the mouth section and the spout.
 12. A dual heating, ventilation, and air conditioning HVAC system for a vehicle, the system comprising: the housing of claim 4; a first HVAC system conditioning air for a front compartment of the vehicle; and a second HVAC system conditioning air for a rear compartment of the vehicle.
 13. A dual heating, ventilation, and air conditioning HVAC system for a vehicle comprising: an integrated evaporator conditioning air, wherein the integrated evaporator has a first member and a second member, the first member experiences a higher air pressure than the second member; and a housing including a drainage port, wherein the integrated evaporator is disposed in the housing, the drainage port of the housing is disposed adjacent to the integrated evaporator such that the drainage port aligns with the first member of the integrated evaporator to draw fluid from the first member.
 14. The dual HVAC system of claim 13 wherein: the drainage port includes a bypass section and a conduit member, the bypass section aligns with the first member, the conduit member defines an inlet that couples to the bypass section and an outlet, and the bypass section and the conduit member define a fluid passage that extends along a section the first member of the integrated evaporator to the outlet of the conduit member such that fluid from the first member flow through the fluid passage and is discharged via the outlet of the conduit member.
 15. The dual HVAC system of claim 13 wherein: the drainage port includes a bypass section and a conduit member, the bypass section defines a first section and a second section of the housing such that a first portion of the first member of the integrated evaporator core aligns with the bypass section, a second portion of the first member of the integrated evaporator core aligns with the first section of the housing, and a third section of the first member of the integrated evaporator core aligns with the second section of the housing, the conduit member defines an inlet that couples to the bypass section and an outlet, and the bypass section and the conduit member define a fluid passage that extends along the first section of the integrated evaporator to the outlet of the conduit member such that fluid from the first section of the first member flows through the fluid passage and is discharged via the outlet of the conduit member.
 16. The dual HVAC system of claim 15 wherein the drainage port includes a spout disposed at an outlet of the conduit member and defines an orifice between the second section of the housing and the spout.
 17. The dual HVAC system of claim 13 further comprising: a front HVAC system conditioning air for a front passenger compartment of the vehicle; and a rear HVAC system conditioning air for a rear passenger compartment of the vehicle, wherein the integrated evaporator conditions air for the front HVAC system and the rear HVAC system. 